Separate 'gen-python-docs' from 'make docs'

This makes sense, as we don't need to regenerate Python docs just to
generate the HTML documentation, and should also fix Travis issues.

CONTRIBUTING.rst

@@ -77,7 +77,7 @@ If you want to make a change that affects the documentation of
 particular facts,
 
 1. Make the change in `doc/command_syntax_usage.rst`
-2. Run `doc/generate_python_docs.py` to update `rho/fact_docs.py`
+2. Run `make gen-python-docs` to update `rho/fact_docs.py`
 3. Check in the new version of `rho/fact_docs.py` with your change
 
 Rho keeps fact documentation in two places - in

Makefile

@@ -20,7 +20,10 @@ help:
 all: build lint tests-coverage
 
 docs:
-	@cd doc; $(MAKE) gen-api; $(MAKE) html; $(MAKE) nojekyll; $(MAKE) gen-python
+	@cd doc; $(MAKE) gen-api; $(MAKE) html; $(MAKE) nojekyll
+
+gen-python-docs:
+	@cd doc; $(MAKE) gen-python
 	mv doc/fact_docs.py rho
 
 build: clean

doc/Makefile

@@ -25,7 +25,7 @@ nojekyll:
 	touch $(BUILDDIR)/html/.nojekyll
 
 gen-python:
-	$(abspath ./generate_python_docs.py)
+	./generate_python_docs.py
 
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).